JP2015015820A - Power supply unit for remote control reception, power supply system for remote control reception, remote control apparatus, program for remote control reception, and program for remote control - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology of a power supply for remote control reception, capable of restarting power generation equipment from a remote site even at a lapse of long time after stopping the power generation equipment and capable of alleviating economical burden.SOLUTION: The present invention comprises a power storage section 7a charged by electric power from a system and electric power from PV7 for UPS power feeding, and a supply section 5c for supplying electric power charged into the power storage section 7a to a monitor controller 6 for controlling power generation equipment having a breaker 1 for interconnection, transformers 2a, PCS3 for interconnection and a photovoltaic power generation section 4 when the power generation equipment stops, by receiving a signal from a remote site.

Description

  Embodiments of the present invention relate to a technology of a remote operation acceptance power source for restarting a power generation facility with a distributed power source disconnected from a system from a remote location and connecting it to the system.

  In a photovoltaic power generation system linked to a commercial grid via a grid breaker and a PCS (power conditioning system), if an abnormality occurs on the grid side, the grid breaker is disconnected, The power generation equipment may be stopped.

  At this time, in a general industrial photovoltaic power generation system, power failure compensation is performed using a storage battery or UPS (Uninterruptible Power Supply). That is, even after the power supply from the system is stopped, the device is normally stopped by supplying power from the storage battery or UPS to the device.

  For example, the power generation facility monitoring and control system does not stop immediately even when the interconnection circuit breaker is turned off. With the storage battery, UPS, etc. working, the supervisory control system continues to operate and can be shut down safely.

JP-A-11-225448

  However, such storage batteries and UPS are mainly installed for the purpose of normally stopping the equipment. These use electricity stored while receiving power from the grid at the time of a power failure, and electricity can be used for several hours to several days after a power failure. For this reason, the power source on the premises of the power plant is completely lost within a few hours, at most a few days after the power failure. As described above, when the power generation facility is restarted after the power source is completely lost, the maintenance staff must go to the site and directly operate it manually.

  However, a large-scale solar power generation system called mega solar requires a very large area of land. For this reason, there are many solar power generation systems installed in places with poor transportation such as mountainous areas. And most such solar power generation systems are basically operated unattended.

  Therefore, when a maintenance worker goes to the site from a distance to restart the power generation facility, it takes a lot of time and labor, which is a heavy burden on the power generation company and the maintenance operator.

  On the other hand, if the time during which power is maintained is used, the monitoring control system can be restarted by transmitting an activation signal via a network from a distance.

  However, since whether or not the power generation equipment of the solar power generation system is stopped is not always monitored, there is a high possibility that it takes a certain amount of time and days to be discovered. In order to cope with this, it is necessary to ensure a long time during which power can be supplied. However, in this case, the capacity of the battery to be installed in advance becomes large, and the economic burden becomes excessive. For example, it is unrealistic from the viewpoint of cost to install a large amount of batteries that last for 3 days or more.

Here, at present, most of the usage methods of storage batteries and UPS are as follows.
(1) When control power to a device is lost, electricity can be used only for the time required to safely stop the device. The power failure compensation time is several minutes to several tens of minutes, and UPS is often used for this.

 (2) A case in which electricity can be used when an accident occurs at a power generation facility until the maintenance operator rushes to the site and starts recovery work. The power failure compensation time is several hours, and a DC power supply device having a large capacity storage battery is often used.

  However, in the usage methods (1) and (2) above, for the reasons described above, it is necessary to monitor for 24 hours, or a storage battery with a very large capacity is required. Becomes very large.

  Embodiments of the present invention have been proposed to solve the above-described problems of the prior art, and the purpose of the present invention is to provide remote control even after a long period of time has elapsed since the power generation facility was stopped. It is intended to provide a power supply technology for remote operation reception that can restart power generation equipment and suppress an economical burden.

A power supply device for receiving remote operation according to an embodiment of the present invention has been proposed in order to achieve the above object, and has the following characteristics.
(a) Power storage unit that is charged by power from the grid and power from a distributed power source that does not require operation for power generation
(b) A supply unit that supplies electric power charged to the power storage unit when the power generation facility is stopped with respect to a control device that controls the power generation facility by receiving a signal from a remote location.

Configuration diagram of remote operation acceptance system of embodiment

The remote operation acceptance power supply system of this embodiment will be described with reference to FIG.
[Constitution]
[Power generation equipment]
First, a power generation facility to which the present embodiment is applied will be described. This power generation facility has a connection transformer 2 a, a PCS 3, and a solar power generation unit 4 connected to a commercial system via a connection circuit breaker 1.

  The interconnection circuit breaker 1 is a circuit breaker that connects the solar power generation unit 4 to the system of the power generation facility and disconnects from the system. The interconnection circuit breaker 1 can be controlled to be opened and closed by a monitoring control device 6 described later.

  The interconnection transformer 2a is a transformer that is connected between the PCS 3 and the interconnection breaker 1 and boosts the electric power from the photovoltaic power generation unit 4 according to the system side for interconnection with the system. is there.

  The PCS 3 is a device that is connected between the photovoltaic power generation unit 4 and the interconnection transformer 2a and that connects the electric power from the solar cell photovoltaic power generation 4 to the system. The PCS 3 has a maximum power tracking (MPPT) control function, a grid connection protection function, and the like in addition to an inverter function that converts a direct current from the photovoltaic power generation unit 4 into a system alternating current.

  The maximum power follow-up control function is a function for controlling so that the operating point of the output determined by the current and voltage is always maximized according to the output fluctuation of the solar cell. The grid connection protection function is a function for detecting an abnormality on the system side or the inverter side and stopping the inverter function.

  The solar power generation unit 4 is a power generation unit configured by a solar cell module that outputs electric power generated by sunlight. The solar power generation unit 4 is configured by connecting a plurality of solar cell strings in which a plurality of solar cell modules are connected in series so as to obtain desired power.

[Power supply system for remote operation reception]
Next, the configuration of the remote operation acceptance power supply system of this embodiment will be described. This system includes a UPS 5, a monitoring control device 6, a UPS power supply PV 7, and a remote PC 8.

(UPS)
The UPS 5 is an uninterruptible power supply constituting the power supply for remote operation reception according to the present embodiment. The UPS 5 is connected to the system and the above-described power generation facility via the interconnection circuit breaker 1 and the in-house transformer 2b. The UPS 5 is basically a device that instantaneously switches the power source to a storage battery when an abnormality in the power source is detected, such as when power supply from the system is interrupted due to an accident or the like.

  Thus, even if the power from the system is interrupted, the connected devices can be safely stopped by supplying the power stored in the storage battery.

  In order to realize such a basic function, the UPS 5 includes a power storage unit 5a. The power storage unit 5a includes a storage circuit having a predetermined capacity, and a control circuit that performs conversion between alternating current and direct current, and switching between storage and discharge. The power storage unit 5a is charged with power from the grid when connected to the grid, and supplies power to the PCS 3, the monitoring control device 6 and the grid breaker 1 by discharging when disconnected from the grid. .

  In addition to the basic functions described above, the UPS 5 has the following characteristic configuration as a remote operation acceptance power supply device. First, the UPS 5 is provided with an interface such as a connection terminal for the UPS power supply PV 7. A cable from the UPS power supply PV 7 is connected to this interface. The UPS power supply PV7 is a power generation unit that charges the storage battery of the power storage unit 5a with the power generated by sunlight. Note that a PCS that performs power conversion or the like may be provided between the UPS power supply PV 7 and the power storage unit 5a, but this function may be incorporated in the UPS 5.

  The UPS power supply PV 7 basically has the same configuration as the solar power generation unit 4 described above. However, since it is only necessary to obtain power for restarting the power generation facility after the power generation facility is stopped, a small-sized facility may be used.

  The UPS 5 includes a determination unit 5b, a supply unit 5c, and an activation unit 5d. The determination unit 5b is a processing unit that determines that the charge amount of the storage battery in the power storage unit 5a has reached a charge amount that can activate the power generation facility by the monitoring control device 6. For example, the charge amount may be measured by measuring a voltage or current to obtain an available charge amount, but is not limited to a specific method.

  The amount of charge for starting the power generation equipment depends on the scale of the power generation equipment, etc., for example, until the monitoring control device 6 is started, the interconnection circuit breaker 1 is turned on, and power is obtained from the system or PCS 3 The amount of power required is good. Note that the PCS 3 is automatically activated by connection to the system, but the UPS 5 can also supply the control power at the time of activation to the PCS 3.

  The supply unit 5c is a processing unit that switches the power from the power storage unit 5a to be supplied to the monitoring control device 6 when the determination unit 5b determines that the amount of charge is enough to activate the power generation facility. It is.

  The activation unit 5d is a processing unit that activates the monitoring control device 6 together with the supply of power to the monitoring control device 6 by the supply unit 5c. For example, the activation unit 5 d outputs an activation command to the monitoring control device 6.

(Supervisory control device)
The monitoring control device 6 is basically a computer that monitors the system and power generation equipment, and opens and closes the interconnection circuit breaker 1 and controls the PCS 3. The monitoring control device 6 is connected to the UPS 5 and has a function of safely shutting down upon receiving power supply from the UPS 5 when power from the system is cut off.

  The monitoring control device 6 is connected to the network N, and has a characteristic configuration of a notification unit 6a and an activation processing unit 6b in addition to the basic functions described above. The notification unit 6a is a processing unit that outputs a signal to notify the remote PC 8 via the network N that the monitoring control device 6 is in a state of accepting a signal for starting the power generation facility. The activation processing unit 6b is a processing unit that activates the power generation facility when a signal for activating the power generation facility is received from the remote PC 8 via the network N.

  The remote PC 8 is a remote control device configured by a computer connected to the network N and managed by a maintenance operator. The remote PC 8 includes a notification unit 8a and an activation instruction unit 8b. The notification unit 8a is a processing unit that notifies the outside when a signal for starting the power generation equipment is received from the monitoring control device 6. For example, the notification unit 8a displays a message indicating that the power generation facility can be activated on the display, outputs an alarm sound to the speaker, and notifies the maintenance operator.

[Action]
In the present embodiment as described above, an operation of restarting the stopped power generation facility will be described.
[Stopping power generation facilities]
First, when an abnormality such as an accident occurs, the interconnection circuit breaker 1 disconnects the power generation facility by the solar power generation unit 4 from the system. Thereby, although the power supply from the system side is eliminated, the UPS 5 can supply the power from the power storage unit 5 a to the PCS 3 and the monitoring control device 6. In this way, the PCS 3 automatically stops while receiving power supply.

  If the system abnormality continues, the supervisory control device 6 also shuts down safely and does not accept control from the remote PC 8. As a result, the power generation facility stops. When the amount of power stored in the power storage unit 5a is exhausted, it is not possible to accept a startup operation from the remote PC 8. This time is about several minutes to several hours depending on the capacity of the storage battery in the power storage unit 5a.

[Restart power generation equipment]
Thereafter, during a certain period of time during which solar power generation is possible, the storage battery of the power storage unit 5a in the UPS 5 is charged with the power from the UPS power supply PV7. And when the determination part 5b determines with the electrical storage amount of the storage battery having become electric power required for the starting process of power generation equipment, the supply part 5c supplies the electric power from a storage battery to the monitoring control apparatus 6, and the starting part 5d Activates the monitoring control device 6.

  Then, the monitoring control device 6 monitors the system abnormality and determines whether or not the abnormality has been recovered. If it is recovered from the abnormality, the notification unit 6a notifies the remote PC 8 connected via the network N that the power generation facility can be activated and the activation signal is received. Is output. This signal may be a command that causes the remote PC 8 to activate the notification unit 8a, or may be an email or an instant message.

  When the remote PC 8 receives the signal from the supervisory control device 6, the notification unit 8a causes the display to display a message indicating that the power generation facility can be activated, and causes the speaker to output an alarm sound. Inform the person.

  Thereby, the maintenance operator who knows that the power generation facility can be started up operates the input means of the remote PC 8 to execute the operation for starting the power generation facility. Then, the activation instruction unit 8 b outputs an activation instruction signal to the monitoring control device 6. For example, a command that instructs the monitoring control device 6 to start the power generation equipment is transmitted via the network N.

  In the monitoring control device 6 that has received this signal, the activation processing unit 6b performs a closing operation on the interconnection circuit breaker 1, and performs an activation operation on the PCS 3. Thereby, the grid connection operation by the PCS 3 is started, and the generated power from the solar power generation unit 4 can be supplied to the outside.

[effect]
The effects of the present embodiment as described above are as follows. Even if it exceeds the time when the UPS 5 can be restarted after stopping the power generation facility, it can be restarted remotely by receiving power supply from the UPS power supply PV 7.

  For this reason, it is not necessary to monitor the power generation facilities for 24 hours or prepare a very large storage battery capacity, and it is possible to reduce the economic burden on the power generation company and the maintenance operator.

  The UPS 5 can automatically start the supervisory control device 6 and the power generation facility can be restarted from the remote PC 8, so that the necessary personnel can be greatly reduced. In particular, the restartable time is mainly a time zone in which solar power generation is possible, so it coincides with the normal working hours of maintenance personnel, and the monitoring burden is small.

  In addition, the notification unit 6a notifies that it is in a state of accepting a signal from a distance, and the notification unit 8a notifies that it can be restarted with an image or sound. For this reason, it is prevented that the maintenance worker misses the restartable time. Furthermore, since the determination unit 5b determines whether sufficient power can be obtained for activation, the activation process can be reliably performed.

[Other Embodiments]
The present invention is not limited to the above embodiment. For example, the determination unit 5b may be omitted, and the activation unit 5d may activate the monitoring control device 6 together with the power supply by the supply unit 5c during the time when power from the UPS power supply PV 7 is obtained. In the day, at the preset time, the activation unit 5d activates the monitoring control device 6, and at that time, as described above, the notification by the notification unit 6a and the reception of the signal from the activation instruction unit 8b You may set so that. In this way, maintenance personnel can check at a fixed time, so the monitoring burden is small. Further, if the activation time is limited to a predetermined time of the day, the amount of charge of the storage battery can be saved even when the maintenance staff overlooks it.

  In this case, even during the set time, the power from the UPS power supply PV 7 and the charge amount of the storage battery are not sufficient for starting the power generation facility, and there is a possibility that the power generation facility cannot be started. However, as described later, it is possible to increase the possibility of starting the power generation facility by combining a plurality of types of power generation devices.

  In addition, as a distributed power source that does not require an operation for power generation, a power generation device using natural energy may be used because it is unnecessary to supply fuel or the like from the outside. Hydropower or geothermal power may be used, but in particular, a solar power generation device or a wind power generation device is suitable because it can generate power even if it is completely unmanned and can secure power generation time. If it is a power generation device using a relatively small water wheel, electric power can always be obtained. Furthermore, if a plurality of types of natural energy power generation devices are combined, the time during which power can be supplied can be extended. For example, a solar power generation device and a wind power generation device may be used in combination.

  As a storage battery of the electrical storage part 5a, it can also be comprised at low cost, for example with a capacitor | condenser, an electric double layer capacitor, etc. other than a general rechargeable battery. Even if the discharge is fast, it is easy to secure electric power by connecting the distributed power source.

  A part of the PCS 3, UPS 5, monitoring control device 6, and remote PC 8 can be realized by controlling a computer including a CPU with a predetermined program. The program in this case realizes the above-described processing by physically utilizing computer hardware. For this reason, the method, program, and recording medium on which the program is executed are also an aspect of the embodiment.

  Moreover, how to set the range processed by hardware and the range processed by software including a program is not limited to a specific mode. For example, any one of the above-described units can be configured as a circuit that realizes each process.

  Furthermore, PCS3, UPS5, supervisory control device 6, remote PC8, etc. only use names that are actually popular for convenience. Any device having the same function as that of the above-described embodiment is included in the scope of the invention regardless of the trade name.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 2a ... In-house transformer 2b ... Interconnection transformer 3 ... PCS
4… Solar power generation module 5… UPS
5a ... Power storage unit 5b ... Determining unit 5c ... Supply unit 5d ... Starting unit 6 ... Monitoring control device 6a ... Notification unit 6b ... Starting processing unit 7 ... PV for UPS feeding
8 ... PC far away
8a ... notification unit 8b ... start instruction unit

Claims (11)

A power storage unit that is charged by power from the system and power from a distributed power source that does not require operation for power generation, and
A supply unit that supplies electric power charged to the power storage unit when the power generation facility is stopped for a control device that controls the power generation facility by receiving a signal from a remote location;
A power supply device for accepting remote operation characterized by comprising:   The power supply device for remote operation reception according to claim 1, wherein the supply unit supplies power to the control device when the distributed power source can supply power. A determination unit that determines that the charge amount of the power storage unit is a charge amount that can activate power generation equipment by the control device;
An activation unit that activates the control device when it is determined that the amount of charge that can be activated by the determination unit;
The power supply device for accepting remote operation according to claim 1 or 2, characterized by comprising:   The remote operation receiving power supply device according to claim 1 or 2, further comprising an activation unit that activates the control device when a preset time is reached. In the power supply apparatus for remote operation reception of any one of Claims 1-4,
The control device is connected;
The power supply system for remote operation reception characterized by the said control apparatus having a notification part which outputs the information which notifies that it is the state which receives the signal from a distant place.   6. The remote operation reception power supply system according to claim 5, wherein the distributed power supply, which is a power generation device using natural energy, is connected to the remote operation reception power supply device. Connected to the control device in the power supply system for remote operation reception according to claim 5 or 6 via a network,
A remote control device that outputs information notifying the outside when information notifying that it is in a state of accepting a signal from a distance is received from the control device. Connected to the control device in the power supply system for remote operation reception according to claim 5 or 6 via a network,
A remote control device that outputs a signal for starting the power generation facility when receiving information notifying that a signal from a distance is received from the control device. Executed by a computer connected to a control device that controls the power generation equipment by receiving a signal from a remote location,
A remote operation acceptance program characterized in that when the power generation equipment is stopped, the power charged from the power system and the power stored in the power storage unit by the power from the distributed power source that does not require an operation for power generation is supplied. It is executed by a computer connected to the control device in the power supply system for remote operation reception according to claim 5 or 6 via a network,
A program for remote control, characterized in that, when information notifying that a signal from a distance is received from the control device is received, information notifying the outside is output. It is executed by a computer connected to the control device in the power supply system for remote operation reception according to claim 5 or 6 via a network,
A program for remote control, which outputs a signal for starting the power generation facility when receiving information from the control device indicating that it is in a state of accepting a signal from a distance.

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